What kind of code are you looking for? AP codes are only available thru April 8th at this time. If you are a AAA member, you can get AAA discounts straight from Disney. If you want a AAA package discount, I believe you must go through a AAA travel agent. Other than those, occassionally people will get emails or postcards with a PIN for a discount. Those are totally random & aren't transferrable, though.
The best place to keep up with any available codes is www.mousesavers.com. Mary is always on top of what's going on! And usually, as soon as she's posted it, someone here relays that info on these boards.